Takeshi and Mizuki have been best friends since high school. They came to Tokyo together to attend the same university. Takeshi is not popular with women, but Mizuki is, and sometimes he brings women over to his house. One day, Takeshi becomes obsessed with an adult video actress called "Tennen Mizuki" and recommends it to Mizuki. When he wakes up in the morning, Mizuki has become the adult video actress Tennen Mizuki.